Compass leg and point.



PATPNTPD SEPT. 26, 1905.

l A. P. ABBTZ. COMPASS LPG AND POINT.

APPLIGATIQNPILPD DB0. 5, 1904.

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Cowllfiss LEG. AND POINT.

Specification of Letters Pate-nt.

Patented Sept. 26, 1905.

I Application filediDeoember 5, 1904 Serial No. 235,488.

To all' whom it muy concern:

Be it known that I, ADOLPH E. ABETZ, a citizen of the United States,residing at New Britain, in the county of Hartford and State ofConnecticut, have invented certain new 'and useful Improvements in Comass Legs and `Points, ofwhich the following 1s a specilication. v

Myinvention relates to improvements in a compass leg and point; andthe'main obj ect 4of myl improvement is toprovide a compassleg with ayielding point. I also adapt this point for ,useas a prickunch.

In the accompanying rawings, Figure 1 is a side elevation of my compassleg and point,

together with a compass-beam attached thereto and provided with twopoints. Fig. 2 is a detached plan'view of the said compassbeam andconnected parts, and Fig. 3 1s an enlarged sectional elevation of thecompass leg-and point without the compass-beam.

The compass-leg is formed mainly of two parts A B put together at themiddle in any lproper manner-as, for eXample,-by a proj ection4 on onepart that fits into asocket 5 on the other part. Both of these artsA Bare bored centrally from e'nd to en and then counterbored from theirmeeting ends to form the enlargements'and opposing shoulders 6 '6. "Thepart A is for the lower or point end of the leg and is referably reducedin size and tapered at t e lower end, as shown. The part B is the handleend and is left larger and is preferably knurled or roughened forconvenience of handling. The two parts A B Itogether'constitute thehandle and,the centering-leg ofthe compass.

The point 7 may be of any desired form at its extreme lower end; but Ihave shown it in the form of a light' rick-punch. It is rovided with abody that fits the central ore of the part A, a flange or enlargement 8,and a reduced portion 9 above the said flange. A

spiral spring 10 is placed within the counterbored portion of the part Awith one end resting on the flange 8 andwith'its opposite end in contactwithany'suitable abutment,

whereby the spring has a constant tendency to project the point 7 fromthe lower end of the part A until yits rejection is limited by theflangeor stop-s oulder 8, while at' the i a rod 11, having anenlargement or flan e 12 and a pad or knob 13 lfor receiving a ight blowfrom the o erators hand. This hammer is placed in t e p art B with theflange 1'1 in position for engaging theshoulder 6 and with the lu perend of the spring 1() engaging the said flange, whereby the said flangeserves` as the resisting abutment or sto shoulder of the spring 10 foryieldingly holging the point 7 in its lprojected position. Acompanioncompass eg or legs may beattached t'o this centeringcompass-legin any ordinary and desired manner. For example, I have illustrated acompass beam or beams 14, with a springsocket 15 and clamp-screws 16,whereby the same may be slipped .upon the -cylindrical portion of thepart A and clamped thereon at any desired position above the point 7.The beam or beams may be provided with any ordinary legs or points-- as,for example, the metal point 17 and pencil-holding pointhlS-adjustablymounted on gently, so as to slightly compress the spring 10, If the workis metal and it is desired to make a light, center as a mark or tosupport vthe point in scribing a circle, the operator strikes a lightblow with the palm of his hand on the` ad 15, thereby compressing thespring 10 ang depressing the rod 11 until its lower end strikes theupper reduced end 9 of the point 7 and forces the point lightly into themetal. will be depressed sufficiently to putl the spring under a lighttension, whereby the point is yieldingly held to its work and the circleis or may be scribed with less danger of losing the center than whenusing a centering compass-leg with a rigid point. When the two egs orpoints 17 and 18 are on the beam, the tool can be tilted on the point 7to carry the top of the part B toward that side havingthe point thatitis desired to use, so that said point may strike the work, While theother point will be raised by the act of tilting the tool, and thereforenot hit the surface of the work. By making the companionl leg or legsadjustable relatively to the length of the centering-leg the compass maybe used for scribing a circle in a different plane from that on whichthe center is located. The advantage of holding the point In scribing acircle the handle f IOO IOO

with certainty under a yielding pressure at the desired center isattained in the use of the leg as a prick-punch for laying out work, asWell as in the use of the device in scribing a circle.

I claim as my invention l. The herein-described implement comprising ahandle, a point slidingly mounted in the lower end thereof and having astopshoulder for limiting the outward projection 0f the said point, ahammer slidingly mounted in the upper end thereof and having astop-shoulder for limiting the outward movement of the said hammer, anda spring interposed between the said point and hammer and acting toforce the said point and hammer outwardly for bringing the saidstopshoulders into engagement with the said handle.

2. The herein-described implement comprising a handle, a point slidinglymounted 3. Theiherein-described implement, comprising a handle forming acompass-leg, a point slidingly and yieldingly mounted in the lower endthereof, a companion compassleg mounted on the said handle, and meansfor adjustably securing the said eoinpassdeg at various points in thelength ol th(` said handle.

ADOLPll 1C. ABlC'lZ.

Witnesses JOHN SILL, Y. J. STEARNs.

